Technotes relevance to XP SP 2???

Hi, I had a good look at the technotes. Think it is a very good contribution from you guys. But with SP 2 launched, are the technotes still relevant??? Are there anything which is lacking? eg. Security centre, firewall configuration ,etc...
Comments
The TechNotes I've written so far, cover the 'current' corresponding exam objectives (see bottom of each TechNotes). I will complete the following final TechNotes for the 70-270 exam this month (hence the free PDF will also come available with all 70-270 TechNotes combined):
- Dial-up networking
- TCP/IP
- Local Security (local users and groups, user right assignments, security configurations)
I'm quite sure it will be very hard to fail the exam after reading all the 70-270 TechNotes, though they are meant to compliment a book, CBT, or classroom course, hence you should not use them as your only source.